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## Index: W

w command (sed): 5.11. Reading and Writing Files
w escape sequence: 11.2.3.4. Extended regular expressions
w flag: 5.3. Substitution
  5.3. Substitution
while loop: 8.2.1. While Loop
whitespace (see space characters)
width, output field: 7.9. Formatted Printing
wildcard metacharacter (see . (dot))
write command (see w command (sed))
writing
  from files: 5.11. Reading and Writing Files
  to files: 2.3.2.1. Saving output
    5.11. Reading and Writing Files
    10.5. Directing Output to Files and Pipes
  regular expressions: 3.2.3. Writing Regular Expressions
  scripts: 1.4. Four Hurdles to Mastering sed and awk
    awk: 7. Writing Scripts for awk
    sed: 4. Writing sed Scripts
  user-defined functions: 9.3. Writing Your Own Functions

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